Is Matter Around Us Pure? — Science STD 9 — Question

What is meant by ‘diffusion’? Give one example of diffusion in gases.

Draw a flow-chart for the schematic representation of different types of matter.

Give two reasons to justify that:
Water is a liquid at room temperature.

Define the term ‘latent heat of vaporization’ of liquid. What is the value of the of the latent heat of vaporization of water?

A boy tries to push a truck parked on the roadside.The truck does not move at all. Another boy pushes a bicycle moves through a certain distance. In which case was the work done more: on the truck or on the bicycle? Give a reason to support your answer.

Define a mixture. Give two points of evidence to show that sugar solution is a mixture.

State the various effects of force.

A beaker full of water is suspended from a spring balance. Will the reading of the balance change:

1. If a cork is placed in water?
2. If a piece of heavy metal is placed in it?

Give reasons for your answer.

State one property in which a solution of sugar in water resembles a mixture of sugar and sand, and one property in which it differs from it.